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on July 31, 2010 at 6:00 AM. Associated PressPowdery mildew is a common fungus disease on many types of plants, including peonies like the ones above. Dear Carol: For the past two years, my peonies have gotten white spots on the leaves. This happens after they have finished blooming.
Spots on peony leaves or mold on the plants is usually caused by one of two peony fungal diseases, botrytis blight (gray mold) or leaf blotch. These diseases tend to flare up in wet weather and plants that are infected early in the season may have severe leaf damage by late summer.